8) $$\frac{p-5}{20} + \frac{p-1}{12}$$

$$\begin{aligned} \frac{p-5}{20} + \frac{p-1}{12} &= \frac{3(p-5) + 5(p-1)}{60} \\ &= \frac{3p-15 + 5p-5}{60} \\ &= \frac{8p-20}{60} \\ &= \frac{4(2p-5)}{60} \\ &= \frac{2p-5}{15} \end{aligned}$$